They're watching Steward brandish a Plexiglas stick at an oblong polycarbonate box sitting behind a wide mesh fence - a rudimentary candy vending machine. As the subordinates look on, he liberates M&M ...

Two studies of wild chimps point to the evolutionary roots of human language. The studies found that chimp communication often relies on rhythmic structures and call combinations.

Chimpanzees are humans' closest living relatives. But does much of their communication resembles ours? According to a new study published earlier this week in the journal Current Biology ...